package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * ClassName:
 * Package: com.sky.service.impl
 * Description:
 *
 * @Author OD老雷
 * @Create 2025/1/22 15:38
 * @Version 1.0
 */
@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    //添加购物车
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        //因为用户id，菜品id，套餐id这几个参数确定了，查到的数据要么只有一条，要么就没有，所以里面的第一条数据就是我们要的id
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);//把前端的DTO类封装到全参数类中给Mapper层操作

        //如果已经存在，只需要将数量加一
        if (list !=null && list.size() > 0){
            ShoppingCart cart = list.get(0);//我们需要的菜品或套餐信息，只有唯一确定的一条
            cart.setNumber(cart.getNumber() +1);
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //如果不存在，需要插入一条购物车数据
            //判断本次添加到购物车的是菜品还是套餐，通过菜品ID和套餐ID是否为空来判断，只能有两种情况，要么是菜品要么是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }

    }

    //查看购物车
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前微信用户的id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    //清空购物车
    @Override
    public void cleanShoppingCart() {
        //获取当前微信用户的id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    //删除购物车中的一个菜品
    @Override
    public void subShoppingCrat(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        //获取当前微信用户的购物车中的菜品数据，要么没有菜品或者只有一个菜品
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //有菜品才操作
        if (list != null &&list.size() > 0){
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if (number == 1){
                //和上一个清空购物车的语句不同，上一个根据用户id来删除，会全部给删了，这个根据表中主键id删除，只会删除该条菜品信息
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else{
                //数量减一
                shoppingCart.setNumber(shoppingCart.getNumber()-1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
